Please see the help docs for the exec associate:  Please remove the word 'wcg' before sunk818.
when I typed exec rac in debug console, it says to use wcg . I'll look for wiki docs, I guess?
09:01:41

exec rac
09:01:41

{
  "Command": "rac",
  "Error": "Sorry, you do not have a CPK.  First please create your CPK by typing 'exec cpk your_nickname'.  This adds your CPK to the chain.  Please wait 3 or more blocks after adding your CPK before you move on to the next step. ",
  "Step 1": "Log into your WCG account at 'worldcommunitygrid.org' with your WCG E-mail address and WCG password.",
  "Step 2": "Click Settings | My Profile.  Record your 'Username' and 'Verification Code' and your 'CPID' (Cross-Project-ID).",
  "Step 3": "From our RPC console, type, exec associate wcg your_username your_verification_code",
  "Step 4": "Wait for 5 blocks to pass.  Then type 'exec rac' again, and see if you are linked!  ",
  "Step 5": "Once you are linked you will receive daily rewards.  Please read about our minimum stake requirements per RAC here: wiki.biblepay.org/PODC"
}